# right angle

- the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°.

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## Origin of right angle^{}

Middle English word dating back to 1350–1400

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for right angle

### Contemporary Examples

### Historical Examples

#### Obtuse, an angle having a wider opening than a right-angle or "perpendicular."

Stained Glass WorkC. W. Whall

#### At the epicentre, the angle of emergence is a right-angle; at a great distance from the epicentre, it is nearly zero.

A Study of Recent EarthquakesCharles Davison

#### Its bole, five feet of stalwart diameter, rose straight and tapering to the first right-angle limbs, each in itself almost a tree.

The Roof TreeCharles Neville Buck

#### At length he rose and climbed on, presently turning at a right-angle to bisect the strip to its boundary before he paused to rest.

The Valiants of VirginiaHallie Erminie Rives

#### The toe is never pointed in line with the leg, but held at a right-angle to it, as in the standing position.

The Morris BookCecil J. Sharp

## right angle

- the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90° or π/2 radians
- at right angles perpendicular or perpendicularly

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## right angle

[rīt]

- An angle having a measure of 90°.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## right angle

An angle measuring ninety degrees, formed by the intersection of two perpendicular lines. (Compare acute angle and obtuse angle.)

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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.